1.360 Degree Swivel Mini Tripod Ball Head with 1/4" Screw Thread Base for DSLR Camera Camcorder.2.This ball heads can withstand heavy loads， lock solidly， and move smoothly.3.Aiming and horizon leveling can be accomplished as one instinctive motion， and rigid lockup takes just a quick twist of one control.4.With a 1/4" screw， you can also mount it onto a shoulder rig with 1/4" screwhole.